La versión beta 4.5.0.2a si que funciona. Rated 5 out of 5 stars

La versión beta "Version 4.5.0.2a" funciona bien en el FireFox 56.0 64bits.
Bajada desde:
https://addons.mozilla.org/EN-US/firefox/addon/xmarks-sync/versions/beta
Desinstalar primero la que se tenga, reiniciar el FF y después, instalar la beta.

Não funciona no Firefox 56.0.1 Rated 1 out of 5 stars

Não está funcionando no Firefox 56.0.1. #temqueveissae!

Rated 1 out of 5 stars

Not working in 56.0

Xmarks not working on Firefox 56.0 (64-bit) Mac. Plase fix Rated 1 out of 5 stars

Xmarks no funciona en Firefox 56.0 (64-bit) Mac

Rated 2 out of 5 stars

not working,Click Install Wizard and log in to no response

not working Rated 1 out of 5 stars

not working

Multi-browser/platform sync awesomeness Rated 4 out of 5 stars

Been using it for years on Windows, Mac, and Linux. It's not perfect but I haven't found anything better. I buy a subscription just to support them. Here's some tips: 1) When using on multiple machines and multiples OSes turn off automatic sync on the browsers you don't use that often. Then restore bookmarks before you begin a session by pulling your bookmarks down from the server. After a clean slate you can sync manually as you'd like. This will improve overall stability of the syncs. 2) Download the beta version for Firefox 56 on the Mac if the stable version isn't working.

Irreplacable Rated 5 out of 5 stars

The only practical sync service between different browsers. Although sometimes sync could be very slow. Now there's beta version for FF57, good job!!!

Not trustful at all Rated 1 out of 5 stars

frequently the sync not work.... today ones again hours lost by research the sync problem.

This time the Team Firefox.... Too much maintenance kills..!!

This user has a previous review of this add-on.

Xmarks user must have Rated 5 out of 5 stars

I have been using Xmarks premium for above 2 years.
sync bookmarks across to IE also Android Dolphin browser. I can open remote tab from another browser. It make my day, Keep support them.

became legacy and not working anymore Rated 1 out of 5 stars

Plugin does not work anymore. Looks like it is not supported.

This user has a previous review of this add-on.

broken on firefox 56.0.1 Rated 1 out of 5 stars

not working for me on this version

Problema en Firefox 56 Rated 1 out of 5 stars

No funciona en en la versión 56 de Firefox.

Не нашел как еще сообщить о проблеме Rated 5 out of 5 stars

Windows 10. Xmarks перестал работать на Mozilla. В Окне настроек, не работает войти/выйти, запустить мастер настройки. При нажатии синхронизация ничего не происходит

Sigh - Time to move to Chrome after this no longer works in FF56 Rated 2 out of 5 stars

I really really like this add-on but now since it doesn't work I have moved to Chrome where it works very well.
So good by Firefox. You were always my preferred browser but now I have to move on.

It should be fixed for new versions of Firefox Rated 5 out of 5 stars

I had to downgrade Firefox to version 55, because Xmarks is an important tool and there are not valid substitutes. Will there be a new version of the Product?

This user has a previous review of this add-on.

This ids how to fix Xmarks .... Rated 5 out of 5 stars

Xmarks did not work anymore since I upgraded Firefox to V56.
Strangely, to revert to an older version of Firefox and Xmarks did not allow to restore the operation of Xmarks.
Here is the procedure I followed on PC:
Uninstall Firefox
In Windows Explorer, locate on C: and search for the keyword "firefox" and then delete all the results
Clean Registry with Ccleaner
Download an older version of firefox from the following link. I have chosen version 54.0
http://ftp.mozilla.org/pub/firefox/releases/
Install Firefox 54.0
Start Firefox and immediately block the automatic update of Firefox by changing the settings in the Advanced Options / Updates
Download the version 4.3.15b2 of Xmarks (xmarks_sync-4.3.15b2-sm + fx.xpi) from the following link
https://addons.mozilla.org/EN-US/firefox/addon/xmarks-sync/versions/beta
Install in Firefox the previously downloaded xpi file using the "install a module from a file"
Ask Xmarks to upload your bookmarks to the server instead of your favorites on the computer
There you go !!!!!

Waterfox as an alternative (- but does have a 64 bit limitation) Rated 5 out of 5 stars

I have always been thankful how wonderfully Xmarks has performed for me. So first and foremost thanks. The current malfunctioning issue with FF56/57 and in my case also a little bit prior to FF56 left me realising how invaluable this add-on has been. I discovered the existence of the Waterfox browser and I have found Xmarks works fine with the current version and all my other add-ons seem to be working fine too... so for me it looks like the solution and I am asking would I even bother switching back even if they fixed the problem on FF56.

doens't work with FF56+ Rated 1 out of 5 stars

it worked like a charm before now it fails to sync

Web Extension version 4.5.0.1a Works Rated 4 out of 5 stars

The web extension version worked just fine for me on FF 56.0 (64-bit).

https://addons.mozilla.org/EN-US/firefox/addon/xmarks-sync/versions/beta

I did have some minor trouble with messed up bookmarks after its first sync. I would recommend exporting your bookmarks first, just in case.

So far, so good! Thanks devs.